Sanyo 24KHS72 Service Manual - Page 47

Defect in the outdoor unit, P.C. board., Defect or connection error, in the inter-unit cable

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( Continued from the previous page A. ) A ( Continued from the previous page B. ) B Yes Defect or connection error in the inter-unit cable Is the voltage of about DC22V to 24V given between the terminals 2 and 3 on the indoor unit terminal strip (Serial Communication Line) ? (Fig. 2) No Defect in the indoor unit P.C. board 1. Turn OFF the power and wait until the power lamp (LED) of the outdoor unit controller is turned OFF. 2. Short-circuit between the terminals 2 and 3 on the outdoor unit terminal strip. (Fig. 3) 1. Turn ON the power and operate the system using the remote controller or the operation button on the indoor unit. 2. Perform the self-diagnosis five seconds after the operation start. Outdoor Unit 1 23456 123 Indoor Unit Fig. 3 Power What is the latest self-diagnosis result ? Condition: E12 Defect in the outdoor unit P.C. board. Condition: E01 1. Turn off the power and wait until the power lamp (LED) of the outdoor unit controller is turned OFF. 2. Remove the short-circuit between the terminals 2 and 3 on the outdoor unit terminal strip. 3. Disconnect the cable from the terminal 3 on the indoor unit terminal strip. (Fig. 4) Short-circuit between the terminals 2 and 3 on the indoor unit terminal board. (Fig. 5) 1. Turn ON the power and operate the system using the remote controller or the operation button on the indoor unit. 2. Perform the self-diagnosis five seconds after the operation start. Outdoor Unit 1 23 4 56 123 Indoor Unit Power Fig. 4 Outdoor Unit 1 23 4 5 6 Power 123 Indoor Unit Fig. 5 What is the latest self-diagnosis result ? Condition: E01 Defect in the indoor unit P.C. board Condition: E12 Defect or connection error in the inter-unit cable 47

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What is the latest self-diagnosis result ?
Condition: E12
Defect in the outdoor unit
P.C. board.
Condition: E01
Defect or connection error
in the inter-unit cable
Defect in the indoor unit
P.C. board
( Continued from the previous page A. )
A
( Continued from the previous page B. )
B
1
2
4
3
5
6
1
2
3
Outdoor Unit
Power
Fig. 3
Indoor Unit
1
2
4
3
5
6
1
2
3
Outdoor Unit
Power
Fig. 4
Indoor Unit
1
2
4
3
5
6
1
2
3
Outdoor Unit
Power
Fig. 5
Indoor Unit
Condition: E12
Condition: E01
1. Turn OFF the power and wait until the power lamp (LED)
of the outdoor unit controller is turned OFF.
2. Short-circuit between the terminals 2 and 3 on the outdoor
unit terminal strip.
(Fig. 3)
1. Turn ON the power and operate the system using the
remote controller or the operation button on the indoor unit.
2. Perform the self-diagnosis five seconds after the operation
start.
1. Turn off the power and wait until the power lamp (LED)
of the outdoor unit controller is turned OFF.
2. Remove the short-circuit between the terminals 2 and 3 on
the outdoor unit terminal strip.
3. Disconnect the cable from the terminal 3 on the indoor unit
terminal strip.
(Fig. 4)
Short-circuit between the terminals 2 and 3 on the indoor unit
terminal board.
(Fig. 5)
1. Turn ON the power and operate the system using the
remote controller or the operation button on the indoor unit.
2. Perform the self-diagnosis five seconds after the operation
start.
What is the latest self-diagnosis result ?
Defect in the indoor unit
P.C. board
Is the voltage of about DC22V to
24V given between the terminals
2 and 3 on the indoor unit terminal strip
(Serial Communication Line) ?
(Fig. 2)
No
Defect or connection error
in the inter-unit cable
Yes
47